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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f071a8ea5d8a97f20135ac24c46c2ab101afa0883876cbe2bc260b48ae81d9c' 
  AND token = 'ta9FR/nzw8iMIpvv8TseqEtGib+ecWHQ1Jqi0f92GnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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