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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e4de859b64159c3c181a1a610b37b871aafdf68e702120384438a90316862b' 
  AND token = '3El2bioIbzD/7+Z6TnkDOpOoQxcjlWL8HUQWsJwVNEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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