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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5406c9bbed0fd8d7c077143eaa1541276d90bbd39420d0367fc99f5b65ebabfd' 
  AND token = 'Xj8REyUC/jidYxFXjswo72D7DWlnr046wTXy9d50vek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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