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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c1741b52f5ca13b4e98b2aa6d5ceb62f7b9a811a8cec3c967eb371fbb1231b' 
  AND token = 'NnZMvo6pakWcC6PqLjHzKT3GnvtY+VRO7D8yL8CjEYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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