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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694a08d5682d3a255528b1d12c3b4badd88adc67df9ca5239e85d95661d43ccd' 
  AND token = '9udMwSjgA385i+S6e1QO1V2vLfAA3cUCDRYNKhojWm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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