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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68e1305336e927f0db93d41b049257ad69a0aa149a97fc7aa5ec63f54a3703a' 
  AND token = '+r9WTTmfDAvK6BLQMP8EqPdUsl35yuVhzoo28yeSyb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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