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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b4cf54a1ffbccbd13275527f6db85a0daff28f58da18f58e200589a36a7dae' 
  AND token = 'r6l4i3xVzefmihqV+WISJ62J+/OLn59EBDu1w5yQjuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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