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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13781e2e5328b44dd86edc5dd1d77ee897f821b67ec7aaa15add90086b4b1214' 
  AND token = '2rt+cyFntr0VUZVeGv+1yuJaNsYW41KZ/2CYVm8Ejmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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