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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471c724780d08e2cb82be19e42dd9c85ed82c3f2b9a709909d0049ddf33592fc' 
  AND token = 'LFxTpHhKNB6kO6+oX5ammooevtdzE3FbRuk2IuIxjKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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