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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe80c925921b06f458bd67c5efd93fd5accc7f7c3fcb9855ea5dd7f435d8bd6' 
  AND token = '1QfxS3gGz9HGfajzTLdoQA4X1LlGUX3H6afkz43mVhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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