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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f161730b07ed799ad77644a9060f9e887349e45011761fd0150278ac4ade1531' 
  AND token = 'Syfshl6te6eNu2QlLguqZGYP22Exbqu6FhhRWKCXeHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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