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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c88789ce6dc0d471d99e3e89de122d56833f72a75b830208a06f5b23456475a' 
  AND token = 'nA1H292r6xK3i9MRC1ml0JfNIigReTkh8QhqZU45jvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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