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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011d62422ff5ec35a6b9c438f15b2e636a9ae5ea57475e6f2eb8dfe9000a4bf5' 
  AND token = 'Tcuh6wAC6yDa4i/eZcS9DosCFa6vt/YeuNm5xCvTdRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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