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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e8b94ad6013fc7a0930df3747a22dc1d259bbf79d9e3b20ae9f8d84676745e' 
  AND token = 'OYbpQM/m+IyPwLrFkA3sO0pbN4CvLjYN2ZcA+esucaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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