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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cec09523925c85322a708bc9690507afc2ee404cab989aceedcf95cc7c4e34' 
  AND token = 'IZ//uvo7lAhPUN6+qzqJpVrVynJdGpoTlorckeDjifE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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