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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39224a9fb1af4e213eabf1f229523073c396b3671d0fe8490b6759f61706c83b' 
  AND token = 'gl+iAARyZr946U+/94+RPQdUu4G8CbjqzIVLE0LddAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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