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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf5ca9feb675803361cd9f31af63ecf970765b04f2ff245f1624b281e7c3604' 
  AND token = 'LYl9VBcwW86fSKo5zwm0abatuGyGi99NJ5XQ2L5b4KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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