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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689eb257a3f94003f8f294a49c86d18b6ab0cee5daf57b1cd7bea8579d3b03f0' 
  AND token = 'i8YrnjIuEzopogUWSokwrcROcvpZx5kGraMcVYeH0RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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