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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b54e365f8680eea0ee10fca5f236a35a7bafc547babf2c982855221462ec1b' 
  AND token = 'KZA23MxVUJRx+2PeD6K9cK12Aa0WYSOX9VMsVLTrgdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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