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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67d273f45504fbf5de0b1924be4835e2b492f7e186ae048a792cc6bc1ae3436' 
  AND token = '5I2F8388Zrm5XhShxqWNWVy7O//f+hZ1tr9urxtIeCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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