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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e2c27ca3e77c893838a3d7793c301cc6d0cde5699a37965c598df5f3483c8a' 
  AND token = 'gFP3lbwiC7EEJZbMjlC0RBM0k+s5i36456KmnnYr06c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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