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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804828f2c4e2ac5022e5e444c045e820b2346b3bb8c18b133ae306fb2a613a8c' 
  AND token = 'ynBOMOWIkawNLnVkVkHYxZguni09gK+HVmYpZd6xY14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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