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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf94223b4d11d306e20051705411ad9a7a731a916878605e7e972bd0cbc7c960' 
  AND token = 'O2mPJr5d3c1d+lRoMphT08ZvZ6LuXH4QKSssDvJ/yMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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