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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307e03baf29355651a555e9a22e21e80a617b104574cf128ef0fd1416da77ef5' 
  AND token = 'zPtrcZ2l6uZhfNb2QTV3wS73J5/yKziHo0YrSLDJgyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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