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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a6a646fc303bd0cddb91a44ce0f8073fef7aebf32ca45c6a220665eb78ed3e' 
  AND token = 'Q5Xwnx1BdJ6fEV1oL7dVXjw04miPWvyDK0xIQ35JBio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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