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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0562b8ebbcf97ce6749f654ed5bf423ad0fcc6c785165f6064f256b657ddad01' 
  AND token = 'vv56qZRJhDZ0jdal9djlW1a3++OcsmLXZbGQii18bf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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