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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbd505ada0accead88c0f57bc7a63cddc0dfb593f5652a2b05edf95d32719dc' 
  AND token = 'ErNdoBQz2F31+ZN9cbM1CUcD5XSuWH9GCcQBXoCdagk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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