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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0147ae111bf3d4a6326f02d673cf4bf80bc93af9927555146748f34e3bc45e1f' 
  AND token = 'evyymOSo4qNg1Tcx8hV2K4gUVzgdVOoWLCsymdymjAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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