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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe2bb62147f97ba32b0d49f7aa0c9d1fa5a8644ee3a390ebeb84af2745550ac' 
  AND token = 'lIwT+TYIO4aFMldeKhogWl0WPZiD8Yc7a2+MWDc6+lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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