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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45f1e4627344f6680e4052cdab3305b6c9e1bb608647cc5299c0788a12b3488' 
  AND token = 'oRRGSW3e5KbSFcBtU1P4bOI9PDa4367JfppMgVLGoM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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