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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e705d1ff5558f863a372b7cdf569f491b0b57e986a634630aa441d41f57a8d' 
  AND token = 'FwL8B0CPRIjII9swPo/0d9b1qsipBTXQXtQlw6jR20A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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