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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5334220480448cc2fc2ebfd293e0b19c199f48706dd11d5ab3c6e6b83ed3a923' 
  AND token = 'Zg9MezyJi9RhcFkTnyY0HCoKGnnPhTLvNg/mdbKEIgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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