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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c885800e36ae8c89fc1324a9ac48a80319aee92844edcc342ef3de79589ed54' 
  AND token = '9TLNEt/g4EJYP/7Tt8ST/uXKTV+1Xt4mIhbnsxfn/Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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