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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0706d6593c52456b51b4489b125bebc8ea08a02a91f81f3f0534e6baad27d42e' 
  AND token = 'DUmerCcy+zWSdPudt7Ph5TLzs5HEcnrUJeZdlbsTmdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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