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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b6c27af052d5313df58027e9336ae7cbc7d8dc7a9e63fa1b5a456093a50b90' 
  AND token = '84m2YSatJRrfyAJfc5ntv4TKonFD1v6tQ8ChJXxzS1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}