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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b958853fd19a757b7d7243c8e0b9b7d57cc59284bf7fb25a41b0ae81156d2852' 
  AND token = 'sX4StBoS5WqFwLXKirJdB75rM8ZVEN5nPMUBEUw7wRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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