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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae72cdb0f47f1036e2757eede6ef71ec9106e60dd3a4692a7ed0bccb5cc8641' 
  AND token = 'tEFnxf6TszbFwfxouQuwudc/+5yKsx4JJAr8PIkq14E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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