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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb05536002e1093c6f720c41bb8fde3b0d922520080eb1f67c232420ec0adade' 
  AND token = '3IDTGewEz9kNHOc/CQq/6u5SkuJoMUI0nL46KsjiVb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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