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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7117771decec96698362032a0e9d248608ffadb27c7c5a3350105985f7527992' 
  AND token = '+/5EedyDC06RA7ya2QfhPPxmMRGbgzNykRjYdeqLE3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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