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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b116411e2d8ab7f4d973cd477752d81d4a3d303970f3ae6533d2c206513644a' 
  AND token = 'QBckGrZnDQTmQvIq1o27WkbT/C38U7ZV02Pvo/2/n40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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