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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5842987853ee263a8f0bd1c8f5768635e5116d282e2ca0279a44478a7a408b' 
  AND token = '2NKEMVn5CeQSSTYVzMUsaIz0WTlhR7heMoB7+95nkvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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