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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc98b99fc07c74d87587ef80a9d8fbc1ee2b646599d29ed4e065dfd2ee1ab513' 
  AND token = 'apx3IMTm1o1mZLuMv2VUTT3eNGMwigROC2UIrPQGWyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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