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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5824f391d03706b7a41313fd2e89c0decf80ab1edf29e098fb9bc67b06dcf29' 
  AND token = 'yqrX1Aoen79EvoQePUIaHFSdMlR3ZPCZ72XhXDSnmhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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