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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b33c03ff1546cc8e9c5d8c3dd49ae172d088495acbb57e8af692551473b965' 
  AND token = 'LyhfZlq2ofpVeyMGxhJaVIgDI5iOqXF0AU6l0SSSj0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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