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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ebeec6af5be8cde9c72a2ef778e4520d679f2a325c2a4c30b230bcdf4d3cf5' 
  AND token = 'ZVuZWEtO2ffpJOTLknx8EPSsGHeIDr3smBJ+eO8nzHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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