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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53705fb63c2b5e058930e0ce73fa84a8ea812f797c8baef24638beaa40bbc5ce' 
  AND token = 'tz2RJLTR0piX7/e9RXVw4B1/1vuzPe05VpJHwJdjZ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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