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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6afee4bb9dbbcd3b07d457e53c19ede45eaf05335190809bc2ab9658fbcd2f' 
  AND token = 'intFaW+fMY1y4m1OnDVRNDRNPfqiU6W3NIjdBOk+z+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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