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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd040910e7f2de1b9302d272bc9c2723316990e10c899740c344c0b82aa14acf1' 
  AND token = 'i5tH9RMlU3riQ18GTc53+rf8iOMdnRFEgZAOye5KtDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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