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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a81ad805aece4e94ec317cc880d06fa345fcc9f2b17d8fdad6bdfe68818cb3' 
  AND token = 'o5No6wPsqKgDNXcvBHnizNnjbpNG426dEDMzWSaTrXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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