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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea70022fb51273a7b049e12a94615664bd80ba1cfa699d769509ed31430b8b0a' 
  AND token = 'ed3MoRpccgkijv+A3wgbWWvHGBTigtj+Cm/JMcLs3Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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