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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b0fc1a612820a94e439bdecc9f949bd6998d79cbd965267c1a4554d136282f' 
  AND token = '+2Tgnwzpkdm0PJs7Q+xABzDUSeBqBULF9W16rUiqaGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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