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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7046c54819f80e1416def348e364d87a6a99a831d3a5175790126c5d85a2858' 
  AND token = '1A9N7CiHypDPnHKdUHMIF3QUz4iwji0KWNbDho719qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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