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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7409b2babfb381c7604f51f6207bfef083c6f163a72abc359c00623377d46954' 
  AND token = '2c53oqsqGXD1aHbJIdiNYJxHqsVky2V/bb3eDlQqfzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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