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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c97e4aec31107403ee4ed252045e7410ee36b4cd9a0aa23402e76327f1e39d5' 
  AND token = 'x7pFGdQIVc/5EK6J41RVbqXF7UMLAprK5i4cmeRxj2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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