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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b75ad5e041aad33b1d86a8ac24d4948ad64c611c4990663c7586e2f48c8822' 
  AND token = 'zFp2/x9lKZK6lzbAnj2KeJq7RredwKVXsf4vcsq9j3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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