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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207fa76dccf941f7c68e2b1cd6706dae875b49f91bed52b79732a4421bd40fdd' 
  AND token = 'QxtLE4BI+i1tTxyq8LdjvZ9ypOLgQ2QWhCFo1govvSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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