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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c038b0433c9cae39053a61327810afd0647e6f36b85af4c51430e8f2c7cf15b' 
  AND token = 'I2Le0qcFsLj6F5QIYV6kZRov5IRJn64tsH2anAIYqNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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