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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8167f8bd3b3710a12a60ac9db1470dbd7b582665f67035ce4f6f89bdc7009f7' 
  AND token = '9cdORVjkDNDU6hyMPMHILaf0tco6n9H6Bgyff1Yl9JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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