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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172fa6b331e839d5b7a0f5a102f06ae93cd09c36296d667fa131b8f70a9c1fb3' 
  AND token = 'UWPYbi5USxa/CKiVgApd1FiAhiRk5TmCDzEMcoDSAJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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