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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97036060e1fea41d52630effc5240c157db378af0e0f77900264a784ef84ce67' 
  AND token = '9u8OEsu8qleLoHhNw77SDWL1aHllMIo6EGuM7BqiUpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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